package io;

import java.io.*;

public class CopyDemo2 {
    public static void main(String[] args) throws IOException {
        FileInputStream fis=new FileInputStream("image.png");
        FileOutputStream fos=new FileOutputStream("image3.png");

        byte[] data=new byte[1024*10];   //10kb
        int d;  //记录每一次实际读取到的字节量
        long start=System.currentTimeMillis();
        while ((d=fis.read(data)) !=-1){
            fos.write(data,0,d);
        }
        long end=System.currentTimeMillis();
        System.out.println("复制完成了！耗时："+(end-start)+"ms");

    }
}
